Default `#getIssuer` in `DPoPTokenProvider` should not hard-code IDPs based on request URLs

[jeswr]

I would suggest having no default at all, and making #getIssuer a callback parameter. If there is a default I would make it based on user-interaction with a pop-up.

reactive-authentication/src/DPoPTokenProvider.ts

Lines 13 to 31 in c733a88

	async #getIssuer(request: Request): Promise<URL> {
	if (request.url.includes(".solidcommunity.net")) {
	return new URL("https://solidcommunity.net")
	} else if (request.url.includes("datapod.igrant.io")) {
	return new URL("https://datapod.igrant.io")
	} else if (request.url.includes(".solidweb.app")) {
	return new URL("https://solidweb.app")
	} else if (request.url.includes("storage.inrupt.com")) {
	return new URL("https://login.inrupt.com")
	} else if (request.url.includes("teamid.live")) {
	return new URL("https://teamid.live")
	} else if (request.url.includes(".solidweb.org")) {
	return new URL("https://solidweb.org")
	} else if (request.url.includes("localhost:3000")) {
	return new URL("http://localhost:3000")
	} else {
	throw new Error(`Unknown issuer ${request.url}`)
	}
	}

[langsamu]

This all definitely has to go.